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Thrombin inhibitor complex

Analyse Thrombin inhibitor complex in the GL1X research workbench: secondary structure, accessibility, pockets, interfaces, conservation, variants, modifications, peptides, crosslinks and neighbours on the 3D structure.

PDB
1KTT
Type
protein
Length
289 residues
Chains
3
Method
x-ray diffraction
Collection
MolNFT v1 / PDB
Contract
0xDE3723766Bc32dcACD03C17BaA400A7B36837Eba
Owner
0x3396CDB397284571d12822B4ae1189a8E22AAAAA
Molecule
Thrombin; Hirudin iib
EC
3.4.21.5
UniProt
P00734, P28506
Ligands
C02
Pockets
3 · best druggability 0.57

Structure

x-ray diffraction · 3 distinct chains · 17% helix, 30% strand (DSSP).

ChainMoleculeTypeResiduesSecondary structureUniProt
AThrombin (EC 3.4.21.5)protein2737% helix, 0% strandP00734
BThrombin (EC 3.4.21.5)protein25214% helix, 35% strandP00734
CHirudin iibprotein1030% helix, 0% strandP28506

Ligands and binding sites

  • C02 · 4-(5-benzenesulfonylamino-1-methyl-1H-benzoimidazol-2-ylmethyl)-benzamidine · ligand · chains B

Binding sites are the residues within 4.5 Å of a ligand's heavy atoms.

Pockets

3 pockets found on a 1 Å grid, 1 with a druggability of 0.5 or more.

PocketVolume (ų)DruggabilityBuriednessLining residuesInside
12740.570.7839C02
2680.320.7514empty
3500.290.7617empty

Interfaces

2 interfaces between chains.

  • A–B · 1103 Ų buried · 25 hydrogen bonds · protein-protein
  • B–C · 646 Ų buried · 6 hydrogen bonds · protein-protein

Modifications

Observed in the structure: 4 disulfide, 1 modified (disulfide, sulfation).

Compared structures

  • 1KTT · Thrombin inhibitor complex · the same entry in another collection · chain C against C, TM-score 1.00
  • P28506 · AlphaFold monomer V2.0 prediction for hirudin-2B (P28506) · a predicted model of the same protein · chain C against A, TM-score 0.56

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